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Subjects>Math>Other Math

How many 5 digit numbers contain exactly two 7 in them?

Divyaramamurthy73 ∙

Lvl 1

∙ 11y ago

Updated: 4/28/2022

There are 6804 such numbers.

Wiki User

∙ 11y ago

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Continue Learning about Other Math

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How many seven digit numbers contain the number seven at least once?

To find the total number of seven-digit numbers that contain the number seven at least once, we can use the principle of complementary counting. There are a total of 9,999,999 seven-digit numbers in total. To find the number of seven-digit numbers that do not contain the number seven, we can count the number of choices for each digit (excluding seven), which is 9 choices for each digit. Therefore, there are 9^7 seven-digit numbers that do not contain the number seven. Subtracting this from the total number of seven-digit numbers gives us the number of seven-digit numbers that contain the number seven at least once.

How many four-digit numbers are there between 500 and 3000?

If you include the number 3,000, there are exactly 2,001 4-digit numbers between 500 and 3000.

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